Information handling system with sensor activated battery charge level indicator

ABSTRACT

An information handling system includes an motion sensor, an embedded controller, and a battery charge indicator. The motion sensor detects a battery charge request, and provides a trigger signal in response to the battery charge request being detected. The embedded controller receives the trigger signal from the motion sensor, and requests a relative state of charge of a battery in response to the trigger signal. The embedded controller then receives the relative state of charge of the battery, and provides a relative state of charge indication signal. The battery charge indicator receives the relative state of charge indication signal, and outputs an indication of the relative state of charge of the battery based on relative state of charge indication signal.

FIELD OF THE DISCLOSURE

The present disclosure generally relates to information handlingsystems, and more particularly relates to an information handling systemwith sensor activated battery charge level indicator.

BACKGROUND

As the value and use of information continues to increase, individualsand businesses seek additional ways to process and store information.One option is an information handling system. An information handlingsystem generally processes, compiles, stores, or communicatesinformation or data for business, personal, or other purposes.Technology and information handling needs and requirements can varybetween different applications. Thus information handling systems canalso vary regarding what information is handled, how the information ishandled, how much information is processed, stored, or communicated, andhow quickly and efficiently the information can be processed, stored, orcommunicated. The variations in information handling systems allowinformation handling systems to be general or configured for a specificuser or specific use such as financial transaction processing, airlinereservations, enterprise data storage, or global communications. Inaddition, information handling systems can include a variety of hardwareand software resources that can be configured to process, store, andcommunicate information and can include one or more computer systems,graphics interface systems, data storage systems, networking systems,and mobile communication systems. Information handling systems can alsoimplement various virtualized architectures. Data and voicecommunications among information handling systems may be via networksthat are wired, wireless, or some combination.

SUMMARY

An information handling system includes an accelerometer, an embeddedcontroller, and a battery charge indicator. The accelerometer may detecta battery charge request, and provides a trigger signal in response tothe battery charge request being detected. The embedded controller mayreceive the trigger signal from the accelerometer, and may request arelative state of charge of a battery in response to the trigger signalfrom a battery management unit (BMU). The embedded controller may thenreceive the relative state of charge of the battery, and may provide arelative state of charge indication signal. The battery charge indicatormay receive the relative state of charge indication signal, and mayoutput an indication of the relative state of charge of the batterybased on relative state of charge indication signal.

BRIEF DESCRIPTION OF THE DRAWINGS

It will be appreciated that for simplicity and clarity of illustration,elements illustrated in the Figures are not necessarily drawn to scale.For example, the dimensions of some elements may be exaggerated relativeto other elements. Embodiments incorporating teachings of the presentdisclosure are shown and described with respect to the drawings herein,in which:

FIG. 1 is a block diagram of a portion of an information handling systemaccording to at least one embodiment of the disclosure;

FIG. 2 is a flow diagram of a method for providing a battery chargelevel indication when a sensor of the information handling systemexperiences a first time boot according to at least one embodiment ofthe present disclosure;

FIG. 3 is a flow diagram of a method for providing a battery chargelevel indication when the information handling system is powered off butthe sensor remains powered according to at least one embodiment of thepresent disclosure;

FIG. 4 is a flow diagram of a method for providing a battery chargelevel indication when the information handling system powered onaccording to at least one embodiment of the present disclosure; and

FIG. 5 is a block diagram of a general information handling systemaccording to an embodiment of the present disclosure.

The use of the same reference symbols in different drawings indicatessimilar or identical items.

DETAILED DESCRIPTION OF THE DRAWINGS

The following description in combination with the Figures is provided toassist in understanding the teachings disclosed herein. The descriptionis focused on specific implementations and embodiments of the teachings,and is provided to assist in describing the teachings. This focus shouldnot be interpreted as a limitation on the scope or applicability of theteachings.

FIG. 1 shows a portion of an information handling system 100 thatincludes an motion sensor 102, an embedded controller 104, a batterymanagement unit 106, a battery 108, a battery charge indicator 110, apower button 112, and a direct current (DC) power input jack 114. In anembodiment, the motion sensor 102 can be any type of sensor that iscapable of measuring motion of the information handling system in the X,Y, and Z directions, such as an accelerometer. In an embodiment, thebattery charge indicator 110 can include multiple illuminationcomponents, such as multiple light emitting diodes (LEDs) representingthe level of charge, multiple micro holes with rear backlighting, or thelike. In an embodiment, the battery charge 110 indicator can be locatedon any surface or edge, such as a front edge, of the informationhandling system 100. Similar solutions comprise of information handlingsystems with a capacitive sensor triggered battery charge levelindicator, are prone to false triggers that could cause the informationhandling system to read a battery charge level when not wanted by auser. The unwanted battery charge reads can cause unnecessary powerusage of the battery, which in turn can reduce the overall charge of thebattery. Therefore, an improved battery charge monitoring system withreduced power usage is described herein.

If the motion sensor 102 has never been powered on before or if thebattery 108 has been completely drained, the motion sensor 102 may nothave the firmware installed to monitor for a battery charge levelrequest. In these situations, if the power button 112 is pressed or anAC power adaptor 116 is inserted into the DC power input jack 114, awake up signal can be sent to the embedded controller 104. In anembodiment, the pressing of the power button 112 when the motion sensor102 has never been powered on before. In an embodiment, the detection ofthe AC power adaptor 116 being inserted into the DC power input jack 114can be performed only if the battery 108 has completely died.

After wake up, the embedded controller 104 can initialized the motionsensor 102 to detect battery charge level requests. In an embodiment,the initialization of the motion sensor 102 can include loading firmwareinto the motion sensor 102 to cause the motion sensor 102 only detect ormeasure movements. To minimize false detections, only one direction,such as the Y direction (direction parallel to the tap force) isenabled. The firmware of the motion sensor 102 can also cause the motionsensor 102 to be able to distinguish between proper requests and othermovements of the information handling system 100. For example, themotion sensor 102 can measure a time domain waveform of detectedmovements, and can utilize a Fast Fourier Transform (FFT) conversion ofthe time domain waveform to verify that the movement was a properrequest, such as double tap on the front of the information handlingsystem 100, and not an individual carrying the information handlingsystem 100 while walking, going up and down the stairs, riding a bike orauto on bumpy road, light drop the system on the desk, or any other typeof movement of the information handling system 100. One of ordinaryskill in the art would recognize that the double tap input can bereplaced with other types inputs measured by the sensor, as long as theother types of inputs can be distinguished from random shakes or othermovements of the information handling system, without varying from thescope of this disclosure.

Once initialized, the motion sensor 102 can monitor for battery chargelevel requests, such as a pre-defined pattern. In an embodiment, thepre-defined pattern can be a double tap, a gesture, or the like. In anembodiment, the motion sensor 102 can determine whether the taps of thedouble tap occur within a given interval of time. In an embodiment, thethreshold time interval can be a default time interval when theinformation handling system 100 experiences a first boot, but can bechanged by an administrator, if desired. The power consumption of themotion sensor 102 is extremely low so no significant impact to standbybattery life is caused by the motion sensor 102 always remaining on evenif the rest of the information handling system 100 is powered down.

When a double tap or other pre-defined taps or gestures input isdetected, the motion sensor 102 can provide a signal to the embeddedcontroller 104, such as a trigger signal. The signal can cause theembedded controller 104 to wake-up if the embedded controller 104 waspowered down. The signal can also cause the embedded controller 104 torequest a relative state of charge (RSOC) of the battery 108 from thebattery management unit 106. The battery management unit 106 can receivethe RSOC request from the embedded controller and can read the RSOC ofthe battery 108. The battery management unit 106 can then return theRSOC of the battery 108 to the embedded controller 104, which in turncan cause the battery indicator 110 to provide a visual indication ofthe RSOC of the battery 108. In an embodiment, a different number ofillumination components within the battery charge indicator 110 areilluminated based on the RSOC of the battery 108. For example, thehigher the RSOC of the battery 108 the greater number of illuminationcomponents within the battery charge indicator 110 that are illuminatedor displayed. The embedded controller 104 can then determine whether atimer for the battery charge indicator 110 has expired. When the timerhas expired, embedded controller 104 can turn off the battery chargeindicator 110. Thus, the motion sensor 102 can monitor for and detect abattery charge request during any power state of other components of theinformation handling system 100, such as powered on or powered off, andcan ensure that only proper requests cause the RSOC of the battery 108to be read and displayed so that standby power loss can be reduced.

FIG. 2 is a flow diagram of a method 200 for providing a battery chargelevel indication when a sensor of the information handling systemexperiences a first time boot according to at least one embodiment ofthe present disclosure. At block 202, a determination is made whether apower button of the information handling system is pressed or analternating current (AC) adapter is inserted within the informationhandling system. In an embodiment, the pressing of the power button canbe detected only in situations where the information handling system hasnever been powered on before, such that the information handling systemis experiencing a first boot. When the power button of the informationhandling system is pressed or the AC adapter is inserted within theinformation handling system, an embedded controller of the informationhandling system wakes up at block 204.

At block 206, a sensor used to trigger an embedded controller to query abattery relative state of charge (RSOC) is initialized. In anembodiment, the sensor is initialized only if the embedded controllerdetermines that the sensor's firmware is out of date. In an embodiment,the sensor can be any motion sensor, such as an accelerometer, that iscapable of measuring motion of the information handling system in the X,Y, and Z directions. In an embodiment, the initialization of the sensorcan be to cause the sensor only detect or measure movements in onedirection, such as in a direction parallel to a tap force so that thechances of a false trigger are reduced. At block 208, a determination ismade whether a double tap of the sensor has been detected. In anembodiment, the sensor can determine whether the double tap detected isa proper request for checking the battery charge level. In anembodiment, a proper request is a double tap on the front edge of theinformation handling system with a time interval between the taps beingbelow of threshold interval. One of ordinary skill in the art wouldrecognize that the double tap input can be replaced with other typesinputs measured by the sensor, as long as the other types of inputs canbe distinguished from random shakes or other movements of theinformation handling system, without varying from the scope of thisdisclosure. In an embodiment, the threshold time interval can be adefault time interval when the information handling system experiences afirst boot, but can be changed by an administrator, if desired. Thesensor can measure a time domain waveform of detected movement, and canutilize a Fast Fourier Transform (FFT) conversion of the time domainwaveform to verify that the movement was a double tap on the front ofthe information handling system and not an individual carrying theinformation handling system while walking, or any other type ofmovement.

When a double tap input is detected, a relative state of charge (RSOC)of the battery is read at block 210. In an embodiment, the RSOC can beread by the embedded controller via a battery management unit of theinformation handling system. At block 212, a visual indication of theRSOC is provided via a battery charge indicator. In an embodiment, thebattery charge indicator can include multiple illumination components,such as multiple light emitting diodes (LEDs), multiple micro holes withrear lighting, or the like. In an embodiment, the battery chargeindicator can be located on one of the edges, such as a front edge, ofthe information handling system. In an embodiment, a different number ofthe illumination components within the battery charge indicator areilluminated based on the RSOC of the battery. For example, the higherthe RSOC of the battery the greater number of illumination componentsthat are illuminated. At block 214, a determination is made whether atimer for the battery charge indicator has expired. When the timer hasexpired, the battery charge indicator is turned off at block 216, andthe flow continues as stated above at block 208.

FIG. 3 is a flow diagram of a method 300 for providing a battery chargelevel indication when the information handling system is powered off butthe sensor remains powered on with the firmware up-to-date according toat least one embodiment of the present disclosure. At block 302, adetermination is made whether a double tap of a sensor has beendetected. In an embodiment, the sensor can be an accelerometer that iscapable of measuring motion of the information handling system in the X,Y, and Z directions. In an embodiment, the sensor can determine whetherthe double tap detected is a proper request for checking the batterycharge level. In an embodiment, a proper request is a double tap on thefront edge of the information handling system with a time intervalbetween the taps being below of threshold interval. When the double tapinput is detected, an embedded controller of the information handlingsystem wakes up at block 304.

At block 306, a RSOC of the battery is read. In an embodiment, the RSOCcan be read by the embedded controller via a battery management unit ofthe information handling system. A visual indication of the RSOC isprovided via a battery charge indicator at block 308. At block 310, adetermination is made whether a timer for the battery charge indicatorhas expired. When the timer has expired, the battery charge indicator isturned off at block 312, and the flow continues as stated above at block302.

FIG. 4 is a flow diagram of a method 400 for providing a battery chargelevel indication when the information handling system powered onaccording to at least one embodiment of the present disclosure. At block402, a determination is made whether a double tap of a sensor has beendetected. In an embodiment, the sensor can be an accelerometer that iscapable of measuring motion of the information handling system in the X,Y, and Z directions. In an embodiment, the initialization of the sensorcan be to cause the sensor only detect or measure movements in onedirection, such as the Y direction. In an embodiment, the sensor candetermine whether the double tap detected is a proper request forchecking the battery charge level. In an embodiment, a proper request isa double tap on the front edge of the information handling system with atime interval between the taps being below of threshold interval.

When the double tap input is detected, a RSOC of the battery is read atblock 404. In an embodiment, the RSOC can be read by the embeddedcontroller via a battery management unit of the information handlingsystem. A visual indication of the RSOC is provided via a battery chargeindicator at block 406. At block 408, a determination is made whether atimer for the battery charge indicator has expired. When the timer hasexpired, the battery charge indicator is turned off at block 410, andthe flow continues as stated above at block 402.

FIG. 5 illustrates a general information handling system 500 including aprocessor 502, a memory 504, a northbridge/chipset 506, a PCI bus 508, auniversal serial bus (USB) controller 510, a USB 512, a keyboard devicecontroller 514, a mouse device controller 516, a configuration an ATAbus controller 520, an ATA bus 522, a hard drive device controller 524,a compact disk read only memory (CD ROM) device controller 526, a videographics array (VGA) device controller 530, a network interfacecontroller (NIC) 540, a wireless local area network (WLAN) controller550, a serial peripheral interface (SPI) bus 560, a NVRAM 570 forstoring BIOS 572, and a baseboard management controller (BMC) 580. BMC580 can be referred to as a service processor or embedded controller(EC). Capabilities and functions provided by BMC 580 can varyconsiderably based on the type of information handling system. Forexample, the term baseboard management system is often used to describean embedded processor included at a server, while an embedded controlleris more likely to be found in a consumer-level device. As disclosedherein, BMC 580 represents a processing device different from CPU 502,which provides various management functions for information handlingsystem 500. For example, an embedded controller may be responsible forpower management, cooling management, and the like. An embeddedcontroller included at a data storage system can be referred to as astorage enclosure processor.

For purpose of this disclosure information handling system 500 caninclude any instrumentality or aggregate of instrumentalities operableto compute, classify, process, transmit, receive, retrieve, originate,switch, store, display, manifest, detect, record, reproduce, handle, orutilize any form of information, intelligence, or data for business,scientific, control, entertainment, or other purposes. For example,information handling system 500 can be a personal computer, a laptopcomputer, a smart phone, a tablet device or other consumer electronicdevice, a network server, a network storage device, a switch, a router,or another network communication device, or any other suitable deviceand may vary in size, shape, performance, functionality, and price.Further, information handling system 500 can include processingresources for executing machine-executable code, such as CPU 502, aprogrammable logic array (PLA), an embedded device such as aSystem-on-a-Chip (SoC), or other control logic hardware. Informationhandling system 500 can also include one or more computer-readablemedium for storing machine-executable code, such as software or data.

System 500 can include additional processors that are configured toprovide localized or specific control functions, such as a batterymanagement controller. Bus 560 can include one or more busses, includinga SPI bus, an I2C bus, a system management bus (SMBUS), a powermanagement bus (PMBUS), and the like. BMC 580 can be configured toprovide out-of-band access to devices at information handling system500. As used herein, out-of-band access herein refers to operationsperformed prior to execution of BIOS 572 by processor 502 to initializeoperation of system 500.

BIOS 572 can be referred to as a firmware image, and the term BIOS isherein used interchangeably with the term firmware image, or simplyfirmware. BIOS 572 includes instructions executable by CPU 502 toinitialize and test the hardware components of system 500, and to load aboot loader or an operating system (OS) from a mass storage device. BIOS572 additionally provides an abstraction layer for the hardware, such asa consistent way for application programs and operating systems tointeract with the keyboard, display, and other input/output devices.When power is first applied to information handling system 500, thesystem begins a sequence of initialization procedures. During theinitialization sequence, also referred to as a boot sequence, componentsof system 500 are configured and enabled for operation, and devicedrivers can be installed. Device drivers provide an interface throughwhich other components of the system 500 can communicate with acorresponding device.

Information handling system 500 can include additional components andadditional busses, not shown for clarity. For example, system 500 caninclude multiple processor cores, audio devices, and the like. While aparticular arrangement of bus technologies and interconnections isillustrated for the purpose of example, one of skill will appreciatethat the techniques disclosed herein are applicable to other systemarchitectures. System 500 can include multiple CPUs and redundant buscontrollers. One or more components can be integrated together. Forexample, portions of northbridge/chipset 506 can be integrated withinCPU 502. Additional components of information handling system 500 caninclude one or more storage devices that can store machine-executablecode, one or more communications ports for communicating with externaldevices, and various input and output (I/O) devices, such as a keyboard,a mouse, and a video display. An example of information handling system500 includes a multi-tenant chassis system where groups of tenants(users) share a common chassis, and each of the tenants has a unique setof resources assigned to them. The resources can include blade serversof the chassis, input/output (I/O) modules, Peripheral ComponentInterconnect-Express (PCIe) cards, storage controllers, and the like.

Information handling system 500 can include a set of instructions thatcan be executed to cause the information handling system to perform anyone or more of the methods or computer based functions disclosed herein.The information handling system 500 may operate as a standalone deviceor may be connected to other computer systems or peripheral devices,such as by a network.

In a networked deployment, the information handling system 500 mayoperate in the capacity of a server or as a client user computer in aserver-client user network environment, or as a peer computer system ina peer-to-peer (or distributed) network environment. The informationhandling system 500 can also be implemented as or incorporated intovarious devices, such as a personal computer (PC), a tablet PC, aset-top box (STB), a personal digital assistant (PDA), a mobile device,a palmtop computer, a laptop computer, a desktop computer, acommunications device, a wireless telephone, a land-line telephone, acontrol system, a camera, a scanner, a facsimile machine, a printer, apager, a personal trusted device, a web appliance, a network router,switch or bridge, or any other machine capable of executing a set ofinstructions (sequential or otherwise) that specify actions to be takenby that machine. In a particular embodiment, the computer system 500 canbe implemented using electronic devices that provide voice, video ordata communication. Further, while a single information handling system500 is illustrated, the term “system” shall also be taken to include anycollection of systems or sub-systems that individually or jointlyexecute a set, or multiple sets, of instructions to perform one or morecomputer functions.

The information handling system 500 can include a disk drive unit andmay include a computer-readable medium, not shown in FIG. 5, in whichone or more sets of instructions, such as software, can be embedded.Further, the instructions may embody one or more of the methods or logicas described herein. In a particular embodiment, the instructions mayreside completely, or at least partially, within system memory 504 oranother memory included at system 500, and/or within the processor 502during execution by the information handling system 500. The systemmemory 504 and the processor 502 also may include computer-readablemedia.

While the computer-readable medium is shown to be a single medium, theterm “computer-readable medium” includes a single medium or multiplemedia, such as a centralized or distributed database, and/or associatedcaches and servers that store one or more sets of instructions. The term“computer-readable medium” shall also include any medium that is capableof storing, encoding, or carrying a set of instructions for execution bya processor or that cause a computer system to perform any one or moreof the methods or operations disclosed herein.

In a particular non-limiting, exemplary embodiment, thecomputer-readable medium can include a solid-state memory such as amemory card or other package that houses one or more non-volatileread-only memories. Further, the computer-readable medium can be arandom access memory or other volatile re-writable memory. Additionally,the computer-readable medium can include a magneto-optical or opticalmedium, such as a disk or tapes or other storage device to storeinformation received via carrier wave signals such as a signalcommunicated over a transmission medium. Furthermore, a computerreadable medium can store information received from distributed networkresources such as from a cloud-based environment. A digital fileattachment to an e-mail or other self-contained information archive orset of archives may be considered a distribution medium that isequivalent to a tangible storage medium. Accordingly, the disclosure isconsidered to include any one or more of a computer-readable medium or adistribution medium and other equivalents and successor media, in whichdata or instructions may be stored.

When referred to as a “device,” a “module,” or the like, the embodimentsdescribed herein can be configured as hardware. For example, a portionof an information handling system device may be hardware such as, forexample, an integrated circuit (such as an Application SpecificIntegrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), astructured ASIC, or a device embedded on a larger chip), a card (such asa Peripheral Component Interface (PCI) card, a PCI-express card, aPersonal Computer Memory Card International Association (PCMCIA) card,or other such expansion card), or a system (such as a motherboard, asystem-on-a-chip (SoC), or a stand-alone device).

The device or module can include software, including firmware embeddedat a processor or software capable of operating a relevant environmentof the information handling system. The device or module can alsoinclude a combination of the foregoing examples of hardware or software.Note that an information handling system can include an integratedcircuit or a board-level product having portions thereof that can alsobe any combination of hardware and software.

Devices, modules, resources, or programs that are in communication withone another need not be in continuous communication with each other,unless expressly specified otherwise. In addition, devices, modules,resources, or programs that are in communication with one another cancommunicate directly or indirectly through one or more intermediaries.

Although only a few exemplary embodiments have been described in detailherein, those skilled in the art will readily appreciate that manymodifications are possible in the exemplary embodiments withoutmaterially departing from the novel teachings and advantages of theembodiments of the present disclosure. Accordingly, all suchmodifications are intended to be included within the scope of theembodiments of the present disclosure as defined in the followingclaims. In the claims, means-plus-function clauses are intended to coverthe structures described herein as performing the recited function andnot only structural equivalents, but also equivalent structures.

What is claimed is:
 1. An information handling system comprising: amotion sensor to detect a predefined motion pattern, and to provide atrigger signal as a battery charge request in response to predefinedmotion pattern being detected; an embedded controller to communicatewith the motion sensor, the embedded controller to receive the triggersignal from the motion sensor, to request a relative state of charge ofa battery in response to the trigger signal, to receive the relativestate of charge of the battery, and to provide a relative state ofcharge indication signal; a battery charge indicator to communicate withthe embedded controller, the battery charge indicator to receive therelative state of charge indication signal, and to output an indicationof the relative state of charge of the battery based on relative stateof charge indication signal; and a battery management unit tocommunicate with the embedded controller, the battery management unit toreceive the request for the relative state of charge of the battery fromthe embedded controller, to read the relative state of charge of thebattery, and to provide the relative state of charge of the battery tothe embedded controller.
 2. The information handling system of claim 1,wherein the predefined motion is a double tap movement of theinformation handling system in a single direction.
 3. The informationhandling system of claim 2, the motion sensor further to detect thattaps of the double tap movement occur within a specific interval oftime.
 4. The information handling system of claim 2, the motion sensorfurther to measure a time domain waveform of detected movement of theinformation handling system, and to perform a Fast Fourier Transformconversion of the time domain waveform to verify that a movement is thedouble tap movement.
 5. The information handling system of claim 1,wherein the motion sensor remains powered on while remaining componentsof the information handling system are powered off.
 6. The informationhandling system of claim 1, wherein if the embedded controller ispowered off, the embedded controller wakes up in response to therelative state of charge request being received.
 7. An informationhandling system comprising: a motion sensor to detect a predefinedmotion pattern, and to provide a trigger signal as a battery chargerequest in response to predefined motion pattern being detected; anembedded controller to communicate with the motion sensor, the embeddedcontroller to receive the trigger signal from the motion sensor, torequest a relative state of charge of a battery in response to thetrigger signal, to receive the relative state of charge of the battery,and to provide a relative state of charge indication signal; a batterycharge indicator to communicate with the embedded controller, thebattery charge indicator including a plurality of micro holes with arear backlighting, the battery charge indicator to receive the relativestate of charge indication signal, and to illuminate a different numberof the micro holes to output an indication of the relative state ofcharge of the battery based on relative state of charge indicationsignal, wherein a number of the micro holes illuminated increases athigher states of the relative state of charge of the battery; and abattery management unit to communicate with the embedded controller, thebattery management unit to receive the request for the relative state ofcharge of the battery from the embedded controller, to read the relativestate of charge of the battery, and to provide the relative state ofcharge of the battery to the embedded controller.
 8. The informationhandling system of claim 7, wherein the predefined motion is a doubletap movement of the information handling system in a single direction.9. The information handling system of claim 8, the motion sensor furtherto detect that taps of the double tap movement occur within a specificinterval of time.
 10. The information handling system of claim 8, themotion sensor further to measure a time domain waveform of detectedmovement of the information handling system, and to perform a FastFourier Transform conversion of the time domain waveform to verify thata movement is the double tap movement.
 11. The information handlingsystem of claim 7, wherein if the embedded controller is powered off,the embedded controller wakes up in response to the relative state ofcharge request being received.